How To Reinforce Floor Joists Drilled For Pipes

Away from the top and bottom.

How to reinforce floor joists drilled for pipes.

For this discussion we will focus on the traditional dimensional floor joists. I would suggest a steel plate with a hole bored thru on the side of each joist perhaps one on each side. From the top and the bottom if it s a dimensional lumber joist. Add the second header and direct nail this header through the trimmer joists.

Keep the hole at least 2 in. Code requirements probibit the size of hole you need 2 on each side of your 2 hole pipe slope so the joists need to be 8 to comply. Can someone tell me what is the correct way to reinforce some timber floor joists that have been drilled off limits for services as follows. Use 16 d common nails and make sure the tops of the joists are flush.

Direct nail the first header in to the cut joist and through the trimmer joists in to the header. Sometimes joists are notched at the end where they bear on a wall or sill. Since the joists are already undsized the building inspector is being generous to you. The problem is that when the house was built using 2x10 floor joists for the second level a plumber cannot drill directly through the floor joists to route the drain he must drop the pipe below the level of the ceiling.

If the cut outs are too large or in the wrong location the joist can be weakened and unable to support the load it was designed for. Drill holes with a diameter of no more than one third the depth of the joist staying 2 in. Reinforcing joists for new drain lines. First let s take a look at the code 2012 international residential code to see what is required when drilling floor joists.

Tradespeople often need to cut notches or holes in floor and ceiling joists to run pipes ductwork or wires. Nail the double headers to each other three 16 d common nails every foot.